Many engineers may be aware of Elastic Audio (Protools) or Flex (Logic) but few seem to utilise the advanced functions. Once again these require a Grid, mapped to the performance. Even when a Click-Track is used I still map the actual performance, not the metronome. Elastic Audio Events are created for peak transients within the audio, which can be edited and later quantised. This means any performance can be "aligned" to the grid, which is mapped from your drummer usually. Check out these functions - they are incredibly powerful and very musical when used properly. I've made use of these advanced functions tightening up guitar parts such as wah and tremolo, ensuring these modulating effects are in time with the performance. These then not only add an effect but enhance the rhythmic aspect of the groove.